I don't know when the main seasons ends when you live, but bees can swarm almost anytime plants are blooming. There are a lot more swarms in the spring after the apples bloom, many people where I live say.
I think last year the latest call was September. Swarm season is when its "warm season" when bees are busy and as previously stated when things are blooming. In our area most swarms coincide with the major blooms, but as long as those queens are layin and the foragers are flyin, its swarm season.
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